package com.weijian.interceptor;

import cn.hutool.core.convert.Convert;
import cn.hutool.jwt.JWT;
import cn.hutool.jwt.JWTUtil;
import com.weijian.common.BaseContext;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;

/**
 * jwt令牌校验的拦截器
 */
@Component
@Slf4j
public class JwtTokenAdminInterceptor implements HandlerInterceptor {

    /**
     * 校验jwt
     *
     * @param request
     * @param response
     * @param handler
     * @return
     * @throws Exception
     */
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //判断当前拦截到的是Controller的方法还是其他资源
        if (!(handler instanceof HandlerMethod)) {
            //当前拦截到的不是动态方法，直接放行
            return true;
        }
        //1、从请求头中获取令牌
        String token = request.getHeader("Authorization");
        if (token != null && token.startsWith("Bearer ")) {
            token = token.substring(7); // 去掉"Bearer "
        }

        //2、校验令牌
        try {
            JWT jwt = JWTUtil.parseToken(token);
            //注意这里用了hutool工具，得到的object类不能强转，需要需要用其自带的工具转换
            Long userId = Convert.toLong(jwt.getPayload("user_id"));
            BaseContext.setCurrentId(userId);
            //3、通过，放行
            return true;
        } catch (Exception ex) {
            log.error("校验请求头中token失败：{}", ex.getMessage());
            //4、不通过，响应401状态码
            response.setStatus(401);
            return false;
        }
    }
}